Question 564137
x+y=	-4	.............1				
-y=2-x	---------2				
Substitute y in 		(1)									
x+(-2+	x)=	-4
x-2+	x=-4			
x+x=-4				
2x	=	-2								
/	2										
x=	-1										
Plug the value of x in (1)											
x+y	=	-4					
1*-1	+y=	-4				
-1	+		y	=	-4						
y	=	-3								
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